Chinese Journal of Tissue Engineering Research ›› 2021, Vol. 25 ›› Issue (22): 3517-3521.doi: 10.3969/j.issn.2095-4344.3227

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Feasibility of repairing the fixed end non-bolt abutment crown of MK1 precision attachment with porcelain-fused-to-metal crown

Liu Ningning, Wang Bing   

  1. Department of Prosthodontics, First Affiliated Hospital (Affiliated Stomatological Hospital) of Xinjiang Medical University, Urumqi 830054, Xinjiang Uygur Autonomous Region, China
  • Received:2020-08-04 Revised:2020-08-07 Accepted:2020-09-21 Online:2021-08-08 Published:2021-01-20
  • Contact: Wang Bing, Master, Attending physician, Department of Prosthodontics, First Affiliated Hospital (Affiliated Stomatological Hospital) of Xinjiang Medical University, Urumqi 830054, Xinjiang Uygur Autonomous Region, China
  • About author:Liu Ningning, Technician, Department of Prosthodontics, First Affiliated Hospital (Affiliated Stomatological Hospital) of Xinjiang Medical University, Urumqi 830054, Xinjiang Uygur Autonomous Region, China
  • Supported by:
    the Special Scientific Research Project of Health Young Medical Science and Technology Talents in Xinjiang Autonomous Region, No. WJWY-201924 (to WB)

Abstract: BACKGROUND: In clinical work, the main methods to repair the broken porcelain at the fixed end of the precise attachment are to dismantle and re-make, and the prosthodontics department adopts the method of porcelain crown to repair the broken porcelain patients, which has achieved good results.
OBJECTIVE: To compare the repair effects of full crown type, buccal partial crown type and crown the resin after the MK1 precision attachment fixed end collapsed through the experiment in vitro. 
METHODS: Forty-five specimens of MK1 gold porcelain crown fixed end non-bolting dental crown were prepared. Among them, 15 were fully crown reconstructed crown and 15 were buccal and facial reconstructed crown respectively. Conventional bonding of glass ion-cement was performed. The remaining 15 were repaired directly with resin. The maximum shear bonding strength of each sample was detected.
RESULTS AND CONCLUSION: The shear bonding strength of the full-crown reconstructed crown, the buccal and facial reconstructed crown, and the resin directly repaired broken porcelain specimens were (9.95±0.97), (5.50±0.76), and (1.92±0.52) MPa, respectively, with significant differences among the groups (all P < 0.001). The results showed that it was feasible to repair the precise attachment of broken porcelain MK1 with the reconstructed gold porcelain crown, and the reconstructed crown and the reconstructed cheek and face crown were obviously superior to the resin direct repair. 

Key words: materials, oral cavity, denture, MK1 precision attachment, reconstructed crown, porcelain collapse, resin, shear bonding strength

CLC Number: